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Subject: 
Re: Type 5 lines at the edge of primitives
Newsgroups: 
lugnet.cad.dev
Date: 
Mon, 6 May 2002 03:34:57 GMT
Viewed: 
604 times
  
In lugnet.cad.dev, Ross Crawford writes:
Cool! Glad I could help!

And after looking at the discussion Don linked to, I'm wondering if a similar
thing could be done for type 5s on cylinder edges - make the second test point
on the plane where a rectangle would be if it was butted up against the
cylinder - ie at *half* the angle between two adjacent cylinder rectangles.
That way two adjacent cylinder segments "co-operate" to draw the line in the
same way.

Yeah; I actually posted a response to that thread suggesting just this.

I also realised that this will still cause problems if the adjacent object
connects on the same plane as the last rect in the cylinder (/ sphere) - the
only possible solutions I can see for that is extra primitives without type 5s,
or inlining the code & removing them manually. But I would think that's pretty
rare with LEGO bricks, anyway?

Well, it's only a problem if you don't add another type 5 line to the edge.
And I agree that it's probably rare.

--Travis Cobbs



Message has 1 Reply:
  Re: Type 5 lines at the edge of primitives
 
(...) Wow! This is so cool! These cooperating type 5 control points give us both first order continuity between the cylinder and the tangent plane, AND 2nd order continuity between adjacent cylinder parts. All with just a few small changes to a (...) (22 years ago, 6-May-02, to lugnet.cad.dev, lugnet.cad.dat.parts)

Message is in Reply To:
  Re: Type 5 lines at the edge of primitives
 
(...) Cool! Glad I could help! And after looking at the discussion Don linked to, I'm wondering if a similar thing could be done for type 5s on cylinder edges - make the second test point on the plane where a rectangle would be if it was butted up (...) (22 years ago, 6-May-02, to lugnet.cad.dev)

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